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Nureddin Shahnazizadeh (C-R), Director of Iran's Petroleum Engineering and Development Company (PEDEC) and Hans Nijkamp (C-L), a vice-president at Shell, sign an offshore gas field agreement in the capital Tehran, on December 7, 2016.
Iran signed a preliminary agreement with Shell to work towards developing major oil and gas fields as it seeks to boost its output. / AFP PHOTO / ATTA KENAREATTA KENARE/AFP/Getty Images